Update dependency awscli to v1.16.77 (#2807)

This PR contains the following updates:

| Package | Update | Change | References |
|---|---|---|---|
| awscli | patch | `==1.16.74` -> `==1.16.77` | [homepage](http://aws.amazon.com/cli/) |

---

### Renovate configuration

:date: **Schedule**: At any time (no schedule defined).

:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

:recycle: **Rebasing**: Whenever PR becomes conflicted, or if you modify the PR title to begin with "`rebase!`".

:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- renovate-rebase -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://renovatebot.com/gh/marketplace/renovate). View repository job log [here](https://renovatebot.com/dashboard#mesosphere/dcos-commons).

Author: renovate[bot]

frozen_requirements.txt

@@ -23,7 +23,7 @@ aspy.yaml==1.1.1
 astroid==2.0.4
 atomicwrites==1.2.1
 attrs==18.2.0
-awscli==1.16.74
+awscli==1.16.77
 azure-common==1.1.16
 azure-mgmt-network==2.0.0
 azure-mgmt-nspkg==3.0.2